SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e320f8418c724dbea2d5d9555e57312918a306a5a897707b7ae8cfeec7de2af' 
  AND token = 'pBvsoES20LHFgVNRPAd/wJj4yZ9FrZFLHg5vNimJX/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}